单项选择题

一般多肽链中主链骨架上羰基的氧原子与亚氨基的氢原子所形成的氢键是维持蛋白质二级结构的主要次级键。( )

A.正确
B．错误

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单项选择题

If the alarm bell______them, the caretakers wouldn’t notice the fire and it ______ spread to the locker storage next door.A．arouse; hadB．had agitated; wouldn't haveC．were awoken; might haveD．hadn't woken; would have

A.
A．arouse;
B.had
C.were
D.hadn't

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I want to put some money into my bank account, so I' m going to______bank this afternoon. It is in______Midland Street.A．a; theB．the; theC．a; aD．the;

A.
A．a;
B.the;
C.a;
D.the;

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